Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcb5eb4c69eef02…

MALICIOUS

PDF

101.4 KB Created: 2021-07-19 06:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 443aee6e053477a8d8445267d5a97cdf SHA-1: d4e6677419cf1f6fc643a33299a5e812ef2b7273 SHA-256: 9dcb5eb4c69eef02a4daf604a0a025af1017554a3b812ae298c093daf1f788a2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosting PDFs. The presence of 'cmd02ru087gs4/45786213618.pdf' within the document text suggests an attempt to execute commands or exploit vulnerabilities. The document body itself is heavily obfuscated and unreadable, preventing a deeper analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://zhengfutz.com/v15/Upload/file/202178652561639.pdf In PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a644eb29d4f---berejunugevovige.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/banefizebizumulafosibi.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/pepofivotobewobido.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087702322b38---kudinigejevanulivogusoku.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/43710357714.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f010d92aff16e316d2acfa51cdb4531b/katuwujatinoxibema.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/c47b6d373d74454021a1369b729c0dcc/gadozawajode.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/ttv67u5ca1d22t786dq8b6bsi1/dalanumifubedew.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/056788c59a44d3f0dcd8287315ce345a/kadamogifodarakinaki.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4be9768633---68277524224.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/2hbk5q4s63pfncmd02ru087gs4/45786213618.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/xunoxudokafadojadu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e9fe9e56---taxunerajezexaguxixagori.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc48c50de---58526106438.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f29159742e3---powiral.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/nogajulutunuju.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074889e11106---bogudojeluxovizodod.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ts6cgstqoacgo2195h4ojpu512/figelumadoz.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/62534677900.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/5f3fba3c1ca96d36ab8910af2600a1f8/gaberusotadusuxosabo.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/7scq8ehv02159gj277cd493bjj/mawuredafavasuzuzuviwek.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/41595648137.pdfIn PDF document text
    • http://mosjob.ru/images/file/xogasiv.pdfIn PDF document text
    • https://caribemed.com/userfileIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hanging+gardens+of+babylon+location+mapPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001292a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14141 11208 bytes
SHA-256: 10c428cac76ef2aeb9cddaee8b0aed4ff0a2d8004a7a127d5afb64bb6275dd05
font_02_sfnt_off00015b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B0A 17356 bytes
SHA-256: 55f8631a6a2d3c5f9e697bae0adb95efc78ea9383667eb9380954cd920b4159e

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